Speculation #2 (Medomai the Ageless)

I think that the mythic from the Theros block Medomai the Ageless will jump in price because it allows you to take an extra turn if it can deal combat damage.I think this would be good in standard U/W control along with Temporal Trespass  so you can keep your board superiority.While it does have a CMC of 6 that shouldn't be hard to achieve with the deck you would be playing this in.